Honestly, when I read Masasumi-sensei's other work, Green Blood, I've always thought that his art style would really fit in a lovecraftian type of manga. And this manga proves it, I believe this manga is heavily/fully inspired by H.P. Lovecraft, an octopus-like monster with wings, hell they even have H.P. Lovecraft himself as a villain (they look alike tho fr). [spoiler]It's about an ex-police officer trying to get his revenge on a guy who murdered his beloved wife and daughter, he found out that the guy is actually an immortal being who ate the "Yomotsuhegui Fruit", a fruit that will make anyone that ate itbecame immortal. Soon he found out that he himself also has the ability of Yomotsuhegui.[/spoiler] It's a pretty good manga I must say, I really love cosmic horror type of story and this one definitely a good manga to read if you're that kind of person.